The password of an R66 local_account is incorrect when imported from a file
This is due to the fact that R66 passwords must be "pre-hashed" (using the R66 specific method) before being hashed with bcrypt like all other passwords. This "pre-hash" is present in REST but is missing from the import module.
To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information